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/*

  u8x8_d_st7528.c

  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)

  Copyright (c) 2019, olikraus@gmail.com
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification, 
  are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this list 
    of conditions and the following disclaimer.
    
  * Redistributions in binary form must reproduce the above copyright notice, this 
    list of conditions and the following disclaimer in the documentation and/or other 
    materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
  
  ST7528: 16 Graylevel Controller
  https://github.com/olikraus/u8g2/issues/986
  I2C Address: 0x03f (0x7e)
  
*/


#include "u8x8.h"


/* NHD C160100 */
static const uint8_t u8x8_d_st7528_nhd_c160100_init_seq[] = {
    
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */

  
/*
    I2C_out(0x48);//partial display duty ratio
    I2C_out(0x64);// 1/100 duty
    I2C_out(0xA0);//ADC select
    I2C_out(0xC8);//SHL select
    I2C_out(0x44);//initial Com0 register
    I2C_out(0x00);//scan from Com0
    I2C_out(0xAB);//OSC on
    I2C_out(0x26);//
    I2C_out(0x81);	//set electronic volume
    I2C_out(0x15);//vopcode=0x1C
    I2C_out(0x56);//set 1/11 bias
    I2C_out(0x64);//3x
    delay(2);
    I2C_out(0x2C);//
    I2C_out(0x66);//5x
    delay(2);
    I2C_out(0x2E);//
    delay(2);
    I2C_out(0x2F);//power control
    I2C_out(0xF3);//bias save circuit
    I2C_out(0x00);//
    I2C_out(0x96);//frc and pwm
    I2C_out(0x38);//external mode
    I2C_out(0x75);//
    I2C_out(0x97);//3frc, 45 pwm			THIS IS A MODE0 CMD, IT IS USELESS HERE
    I2C_out(0x80);//start 16-level grayscale settings
*/
  U8X8_CA(0x048, 0x064),		/* partial display duty ratio, 1/100 duty*/
  U8X8_C(0x0a0),		                /* ADC */
  U8X8_C(0x0c8),		                /* SHL */
  U8X8_CA(0x044, 0x000),		/* initial Com0 */
  U8X8_C(0x0ab),		                /* start oscillator */
  U8X8_C(0x026),		                /* Select the internal resistance ratio of the regulator resistor */
  U8X8_CA(0x081, 0x015),		/* volumn */
  U8X8_C(0x056),		                /* LCD Bias */
  U8X8_C(0x064),		                /* DC DC step up */
  U8X8_DLY(2),
  U8X8_C(0x02c),		                /* Power Control */
  U8X8_C(0x066),		                /* DC DC step up */
  U8X8_DLY(2),
  U8X8_C(0x02e),		                /* Power Control */
  U8X8_DLY(2),
  U8X8_C(0x02f),		                /* Power Control */
  U8X8_CA(0x0f3, 0x000),		/* bias power save */
  U8X8_C(0x096),		                /* frc and pwm */

  U8X8_CA(0x038, 0x075),		/* ext mode 1*/

  /* graylevel setup */
  U8X8_CA(0x80, 0x00), U8X8_CA(0x81, 0x00), U8X8_CA(0x82, 0x00), U8X8_CA(0x83, 0x00),
  U8X8_CA(0x84, 0x06), U8X8_CA(0x85, 0x06), U8X8_CA(0x86, 0x06), U8X8_CA(0x87, 0x06),
  U8X8_CA(0x88, 0x0b), U8X8_CA(0x89, 0x0b), U8X8_CA(0x8a, 0x0b), U8X8_CA(0x8b, 0x0b),
  U8X8_CA(0x8c, 0x10), U8X8_CA(0x8d, 0x10), U8X8_CA(0x8e, 0x10), U8X8_CA(0x8f, 0x10),

  U8X8_CA(0x90, 0x15), U8X8_CA(0x91, 0x15), U8X8_CA(0x92, 0x15), U8X8_CA(0x93, 0x15),
  U8X8_CA(0x94, 0x1a), U8X8_CA(0x95, 0x1a), U8X8_CA(0x96, 0x1a), U8X8_CA(0x97, 0x1a),
  U8X8_CA(0x98, 0x1e), U8X8_CA(0x99, 0x1e), U8X8_CA(0x9a, 0x1e), U8X8_CA(0x9b, 0x1e),
  U8X8_CA(0x9c, 0x23), U8X8_CA(0x9d, 0x23), U8X8_CA(0x9e, 0x23), U8X8_CA(0x9f, 0x23),

  U8X8_CA(0xa0, 0x27), U8X8_CA(0xa1, 0x27), U8X8_CA(0xa2, 0x27), U8X8_CA(0xa3, 0x27),
  U8X8_CA(0xa4, 0x2b), U8X8_CA(0xa5, 0x2b), U8X8_CA(0xa6, 0x2b), U8X8_CA(0xa7, 0x2b),
  U8X8_CA(0xa8, 0x2f), U8X8_CA(0xa9, 0x2f), U8X8_CA(0xaa, 0x2f), U8X8_CA(0xab, 0x2f),
  U8X8_CA(0xac, 0x32), U8X8_CA(0xad, 0x32), U8X8_CA(0xae, 0x32), U8X8_CA(0xaf, 0x32),

  U8X8_CA(0xb0, 0x35), U8X8_CA(0xb1, 0x35), U8X8_CA(0xb2, 0x35), U8X8_CA(0xb3, 0x35),
  U8X8_CA(0xb4, 0x38), U8X8_CA(0xb5, 0x38), U8X8_CA(0xb6, 0x38), U8X8_CA(0xb7, 0x38),
  U8X8_CA(0xb8, 0x3a), U8X8_CA(0xb9, 0x3a), U8X8_CA(0xba, 0x3a), U8X8_CA(0xbb, 0x3a),
  U8X8_CA(0xbc, 0x3c), U8X8_CA(0xbd, 0x3c), U8X8_CA(0xbe, 0x3c), U8X8_CA(0xbf, 0x3c),

  U8X8_CA(0x038, 0x074),		/* ext mode 0*/

  U8X8_END_TRANSFER(),             	/* disable chip */
  U8X8_END()             			/* end of sequence */
};

static const uint8_t u8x8_d_st7528_powersave0_seq[] = {
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */
  U8X8_CA(0x038, 0x074),		/* ext mode 0*/
  U8X8_C(0x0af),		                /* display on */
  U8X8_END_TRANSFER(),             	/* disable chip */
  U8X8_END()             			/* end of sequence */
};

static const uint8_t u8x8_d_st7528_powersave1_seq[] = {
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */
  U8X8_CA(0x038, 0x074),		/* ext mode 0*/
  U8X8_C(0x0ae),		                /* display off */
  U8X8_END_TRANSFER(),             	/* disable chip */
  U8X8_END()             			/* end of sequence */
};

static const uint8_t u8x8_d_st7528_flip0_seq[] = {
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */
  U8X8_END_TRANSFER(),             	/* disable chip */
  U8X8_END()             			/* end of sequence */
};

static const uint8_t u8x8_d_st7528_flip1_seq[] = {
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */
  U8X8_END_TRANSFER(),             	/* disable chip */
  U8X8_END()             			/* end of sequence */
};


/*
  input:
    one tile (8 Bytes)
  output:
    Tile for st7528 (32 Bytes)
*/

static uint8_t u8x8_st7528_8to32_dest_buf[32];

static uint8_t *u8x8_st7528_8to32(U8X8_UNUSED u8x8_t *u8x8, uint8_t *ptr)
{
  uint8_t v;
  uint8_t a,b;
  uint8_t i, j;
  uint8_t *dest;
  
  for( j = 0; j < 4; j++ )
  {
    dest = u8x8_st7528_8to32_dest_buf;
    dest += j;
    a =*ptr;
    ptr++;
    b = *ptr;
    ptr++;
    for( i = 0; i < 8; i++ )
    {
      v = 0;
      if ( a&1 ) v |= 0xf0;
      if ( b&1 ) v |= 0x0f;
      *dest = v;
      dest+=4;
      a >>= 1;
      b >>= 1;
    }
  }
  
  return u8x8_st7528_8to32_dest_buf;
}




static uint8_t u8x8_d_st7528_generic(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
  uint8_t x, y, c;
  uint8_t *ptr;
  switch(msg)
  {
    /* handled by the calling function
    case U8X8_MSG_DISPLAY_SETUP_MEMORY:
      u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7528_display_info);
      break;
    */
    case U8X8_MSG_DISPLAY_INIT:
      u8x8_d_helper_display_init(u8x8);
      u8x8_cad_SendSequence(u8x8, u8x8_d_st7528_nhd_c160100_init_seq);    
      break;
    case U8X8_MSG_DISPLAY_SET_POWER_SAVE:
      if ( arg_int == 0 )
	u8x8_cad_SendSequence(u8x8, u8x8_d_st7528_powersave0_seq);
      else
	u8x8_cad_SendSequence(u8x8, u8x8_d_st7528_powersave1_seq);
      break;
    case U8X8_MSG_DISPLAY_SET_FLIP_MODE:
      if ( arg_int == 0 )
      {
	u8x8_cad_SendSequence(u8x8, u8x8_d_st7528_flip0_seq);
	u8x8->x_offset = u8x8->display_info->default_x_offset;
      }
      else
      {
	u8x8_cad_SendSequence(u8x8, u8x8_d_st7528_flip1_seq);
	u8x8->x_offset = u8x8->display_info->flipmode_x_offset;
      }
      break;
#ifdef U8X8_WITH_SET_CONTRAST
    case U8X8_MSG_DISPLAY_SET_CONTRAST:
      u8x8_cad_StartTransfer(u8x8);
      u8x8_cad_SendCmd(u8x8, 0x081 );
      u8x8_cad_SendArg(u8x8, arg_int );	/* ssd1326 has range from 0 to 255 */
      u8x8_cad_EndTransfer(u8x8);
      break;
#endif
    case U8X8_MSG_DISPLAY_DRAW_TILE:
      u8x8_cad_StartTransfer(u8x8);
      x = ((u8x8_tile_t *)arg_ptr)->x_pos;
      x *= 4;  // not clear
      
      y = (((u8x8_tile_t *)arg_ptr)->y_pos);
      
    
      
      do
      {
	c = ((u8x8_tile_t *)arg_ptr)->cnt;
	ptr = ((u8x8_tile_t *)arg_ptr)->tile_ptr;

	do
	{
          u8x8_cad_SendCmd(u8x8, 0xb0 | y );	/* set page address */
          u8x8_cad_SendCmd(u8x8, 0x10| (x>>4) );	/* set col msb*/
          u8x8_cad_SendCmd(u8x8, 0x00| (x&15) );	/* set col lsb*/
          
          u8x8_cad_SendData(u8x8, 32, u8x8_st7528_8to32(u8x8, ptr));
          
	  ptr += 8;
	  x += 4;
	  c--;
	} while( c > 0 );
	
	//x += 4;
	arg_int--;
      } while( arg_int > 0 );
      
      u8x8_cad_EndTransfer(u8x8);
      break;
    default:
      return 0;
  }
  return 1;
}


static const u8x8_display_info_t u8x8_st7528_160x100_display_info =
{
  /* chip_enable_level = */ 0,
  /* chip_disable_level = */ 1,
  
  /* post_chip_enable_wait_ns = */ 20,
  /* pre_chip_disable_wait_ns = */ 20,
  /* reset_pulse_width_ms = */ 5, 	
  /* post_reset_wait_ms = */ 5, 		/**/
  /* sda_setup_time_ns = */ 20,		/* st7528  */
  /* sck_pulse_width_ns = */ 25,	/* st7528 */
  /* sck_clock_hz = */ 8000000UL,	/* since Arduino 1.6.0, the SPI bus speed in Hz. Should be  1000000000/sck_pulse_width_ns */
      /* st7528 actually allows 20MHz according to the datasheet */
  /* spi_mode = */ 0,		/* active high, rising edge */
  /* i2c_bus_clock_100kHz = */ 4,
  /* data_setup_time_ns = */ 40,
  /* write_pulse_width_ns = */ 80,	/* st7528 */
  /* tile_width = */ 20,
  /* tile_hight = */ 13,
  /* default_x_offset = */ 0,		/* x_offset is used as y offset for the ssd1326 */
  /* flipmode_x_offset = */ 0,		/* x_offset is used as y offset for the ssd1326 */
  /* pixel_width = */ 160,
  /* pixel_height = */ 100
};

uint8_t u8x8_d_st7528_nhd_c160100(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
    if ( msg == U8X8_MSG_DISPLAY_SETUP_MEMORY )
    {
      u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7528_160x100_display_info);
      return 1;
    }
    return u8x8_d_st7528_generic(u8x8, msg, arg_int, arg_ptr);
}